Acquisitions, Development and Divestures (Details) $ in Millions		3 Months Ended
		Mar. 31, 2016 USD ($) kV Integer mi	Mar. 31, 2015 USD ($)
Continuing Involvement (Details) [Abstract]
Energy purchases		$ 233	$ 329
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]
Income (Loss) from Discontinued Operations (net of income taxes)		$ 0	95
Northeast Pocono Reliability Project [Member]
Development Projects [Abstract]
Total length (in miles) of the expansion project | mi		58
Capacity (in kilovolts) of a transmission line | kV		230
Adder to the return on equity incentive denied in ratemaking request (in basis points) | Integer		100
Project costs capitalized		$ 350
Substations Included In Request | Integer		3
PPL Energy Supply Spinoff [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Effective date of spinoff		Jun. 01, 2015
Initial percent ownership in new company, Talen Energy, by PPL shareowners		65.00%
Initial percent ownership in new company, Talen Energy, by Riverstone Holdings, LLC		35.00%
Continuing Involvement (Details) [Abstract]
Maximum period for Transition Service Agreement (in years)		2 years
Amount for services billed to spinoff		$ 10
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]
Operating revenues			944
Operating expenses			767
Other Income (Expense) - net			7
Interest Expense	[1]		38
Income (loss) before income taxes			146
Income tax expense (benefit)			51
Income (Loss) from Discontinued Operations (net of income taxes)			95
PPL Energy Supply Spinoff [Member] | Talen Energy Marketing [Member]
Continuing Involvement (Details) [Abstract]
Energy purchases		54
PPL Electric Utilities Corp [Member]
Continuing Involvement (Details) [Abstract]
Energy purchases		$ 167	227
PPL Electric Utilities Corp [Member] | Northeast Pocono Reliability Project [Member]
Development Projects [Abstract]
Total length (in miles) of the expansion project | mi		58
Capacity (in kilovolts) of a transmission line | kV		230
Adder to the return on equity incentive denied in ratemaking request (in basis points) | Integer		100
Project costs capitalized		$ 350
Substations Included In Request | Integer		3
PPL Electric Utilities Corp [Member] | PPL Energy Supply Spinoff [Member] | Talen Energy Marketing [Member]
Continuing Involvement (Details) [Abstract]
Energy purchases		$ 54
LG And E And KU Energy LLC [Member]
Continuing Involvement (Details) [Abstract]
Energy purchases		66	92
Louisville Gas And Electric Co [Member]
Continuing Involvement (Details) [Abstract]
Energy purchases		62	88
Kentucky Utilities Co [Member]
Continuing Involvement (Details) [Abstract]
Energy purchases		$ 4	$ 4

[1] Includes interest associated with the Supply Segment with no additional allocation as the Supply segment was sufficiently capitalized .